Shearing-machine.



W. RACHALS.

SHEA'RING MACHINE. APPLICATION men APR. 18. 1916.

2 SHEETSSHEE'T 1.

Patented Apr. 1, 1919.

WALTER RACHALS, 0]? BOARDMAN, OHIO.

SHEARING-MACHINE.

Specification of Letters Patent.

v Patented Apr. 1, 1919.

Application filed April 1a, 1916. Serial No. 91,948.

To all whom it may concern Be it known that I, WVALTER RAoHALs, acitizen of the United States, residing at Boardman, in the county ofMahoning and State of Ohio, have invented certain new and usefulImprovements in Shearin -Machines, of which the following is aspecification.

This invention relates to shearing devices, and more particularly to amachine for shearing heavy stock materials in foundries and mills.

Primarily. the present invention has in view a machine of the characterset forth capable of imposing a powerful leverage on the shearinginstrumentalities by means of a novel arrangement of leverswhereby thecutting capacity of the shearing means represents a maximum multiple ofthe power used in effecting the operation of the device.

Another object of the invention is to provide a simple and substantialarrangement of parts which are strong and, reliable in operation, andfurthermore provide for the observation of the working of the knifeblocks during the operation of the machine, thus facilitating thehandling of the material to be sheared.

With the above and other objects in view which will more readily appearas the nature of the invention is better understood, the same consistsin the novel construction, combination and arrangement of partshereinafter more fully described, illustrated and claimed. Y

A preferred and practical embodiment of the invention is illustrated inthe accompanying drawings. in which Figure 1 is a side elevation oftheimproved shearing machine.

Fig. Qis a vertical sectional view showing the position of the operatingparts when the knife blocks are separated.v

Fig. 3 is a View similar to Fig. 2 showing the position of the operatingparts when the knife blocks are substantially in shearing position.

Fig. 4 is a vertical cross sectional view on the line 44 of Fig. 1looking in the directions of the arrows.

Similar reference characters designate corresponding parts throughoutthe. several figures of the drawin s! In carrying out the presentinvention, it is proposed to provide a machine frame designatedgenerally as F, and which may include in its organization strong andsubstantial casting sections whose dimensions and proportions aredetermined by the requirements of the machine. In this connection, itwill be observed that the frame comprises a bedv section 1, includingastationary knife block 2 andan upper supporting and housing section H.

As will be observed from the severalfigtires of the drawings, thestationary knife block 2 is preferably provided with a knife receivingrecess 3 for receiving the ledger blade 4 of the shear. and cooperateswith a reciprocating knife block 5. One end.6 of this block is slidablyguided in the vertically disposed guideway 7 of the framework of themachine, while the opposite end 8 thereof slides on a guidepost 9 at thefront end of, the machine. Thus, the reciprocating knife block 5 isadapted to have a free reciprocating movement in a vertical direction,and to fully cooperate with the lower knife block 2, the same isprovided with a knife receiving recess 10 and a suitable cutting orshearing blade 11.

For the purpose of imparting the necessarv downward shearing movement tothe knife block 5, the, same has preferably connected to its upper face.the lower ends of the actuating plungers 12 and 13. the upper ends ofwhich are respectively pivotallv engaged with the working ends of a mainlever 14 and supplementary lever 15. That is to savgthe upper ends ofthe plungers 12 and 18 loosely enga e, in the socketed working ends oftbesaid main and supplementary levers. These actuating plungers are of asubstantial and' wide formation. the

same being preferablvcoextensive with the the journal bearing 16 of themain lever. The end of the main lever 14 opposite its connection withthe plunger member 12 is connected with a suitable link 19 which in turnis pivotally connected with a crank arm 20 rigidly carried by a powershaft 21 journaled in the bed portion of the frame. Power to the shaft21 may be supplied from convenient source, and when rotating in thedirection of the arrow in Figs.- 2 and 3 imparts a rocking motion to themain operating lever 14 which with the aid of the supplementary lever 15imparts a true vertical reciprocating motion to the upper knife block. I

In order to transmit the full leverage effect from the main lever 14 tothe reciprocatirig block 5, it willbe observed that the axes 16 and'18of the mainand the supplemental lever are arranged in relatively closeproximity and in thesame horizontal plane, while the'plungers orconfnectors 12 and 13 are duplicates in position and length as well ashaving the upper ends thereof engaging with their respective levers atthe same distance from the center of the axes of said levers. Thisspecific combination and arrangement .of parts has been found veryeffective to secure the maximumleverage effect contemplated by the.present inven- 'tion.

Furthermore, it will be observed that the fr'nain'lever 14; lies inasubstantiallyhori- "zont'al plane, and has a vertical swinging movement,while the supplementary lever 15 is substantially upright" and swings ina horizontal plane. In other wordsfthe swinging movement of the powerends ofthe levers 14 and 15 aresubstantially at right angles to eachvother, while the work ends thereof have a relatively short reciprocatingmovement in substantially vertical planes which are parallel to eachother.

In order to facilitate the operation and increase the efficiency ofthemachine itis preferred to balance or offset theweight of thereciprocating knife block 5, and to this end, there is employed asuitable counterbalance device. designated generally'as B, whichoperates in a pit in the floor on which the machine rests. This deviceessentially comprises the vertical: supporting standards 22- adapted tofreely slide through guide openings; in the stationary knifeblock 2 ateach side of "the shearing blades 4 and 11.

The upper ends of these rods are rigidly connected as at 23 with theupper knife block, while the lower ends 24 thereof are rigidlysecured-in a suitable yoke 25 which is constructed-to pivotally receiveone end 26 of a weighted lever 27 This weighted lever 27, as will beobserved from Fig. 1 is fulcrumed as at 28 in a suitable link 29suspended from the stationary knife block 2.. .Thus,lthe uppers-knifeblockis fully counterbalanced or lifted by the device B, and remainsinert unless acted upon by the system of levers and power element.

From the foregoing, it will be apparent that when power'is applied tothe shaft 21, the crank arm 20 will cause the link 19 to move'in' thepath of a circle, whereby at the highest movement of the crank arm 20,the

link-l9'will elevate the power 'end-"of the lever 14 to its-greatestheight, thus pushing the knife block 5 downwardly to its limit againstthe supportingeflect ofwthe: device B. In this movement, of course, thesupplerne'ntary lever-15 participates, because 'of the link connection17of the latter'with the Since it the reciprocating amount of' shearingpower with a minimum amount of operating power, thus efl ecting economyvin operation and-production.

Without further description, it is thought that the many features andadv-anta-gestof power connections atone end of said main lever, asupplemental lever also pivotally supported in said frame, actuatingplungers carried by thereciprocating knife block and connecting with theworking end of said lever, and means for counterbalancing the weight ofsaid reciprocating knife block located beneath the stationaryknife-block and projecting theret-hrough to engage'with thereciprocating; knife block.

2. A3 shearing machine including a' -stationary knife block, areciprocating-knife block, and means for operating said latter blockcomprising operatively connected levers having independent axes, meansfor connecting said-levers with said reciprocating block, and meansforcounterbalancing the weight of the said reciprocatingebloc thepresent -in vention-will be: readily'apcomprising supporting standardsslidably my signature in the presence of two witmounted in thestationary knife block and nesses. having their upper ends in supportingengagement with the reciprocating block and WALTER RACHALS" 5 theirlower ends connected with a weighted Witnesses:

lever. 1 AGNES A. JOHNSTON, In testimony whereof I hereunto aflix HORACET. SMITH.

Copies of this patent ma; be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

